1. falsify, distort, garble, warp -- (make false by mutilation or addition; as of a message or story)
2. fudge, manipulate, fake, falsify, cook, wangle, misrepresent -- (tamper, with the purpose of deception; "Fudge the figures"; "cook the books"; "falsify the data")
3. falsify -- (prove false; "Falsify a claim")
4. falsify -- (falsify knowingly; "She falsified the records")
5. interpolate, alter, falsify -- (insert words into texts, often falsifying it thereby)
1.
By so much shall I falsify men's hope. - from The Complete Works of William Shakespeare by William Shakespeare